Mike,
The 5-RT/33 spec is rated at an input of +20dBmV. The noise figure (NF) for this amplifier is a +13dB/+12.5dB respectively. It has a gain of 15dB. This is done with a 9dB pad in the feeder pad socket under the amplifier cover with a 1-way feedermaker. This pad should be reduced depending on the feedermaker being used to match the trunk level. MINIMUM input for noise contribution would be a +13dBmV at the return amplifier module.
Your design print should indicate the return amplifier output level on the tombstone. (example: 35dBmV flat) and should be constant throughout the entire designed plant of similar amplifiers. Even though return amplifier housings have different return outputs, the pad/equalizer (gain/slope) is AFTER the return hybrid. If you require the 35dBmV in example, it should be added to the gain (15dB) therefore hitting the amplifier at a +20dBmV. What you inject into the amplifier depends on where you inject and what insertion losses are seen prior to the return amplifier module.
I hope this has helped. Please call if you have any questions!
Re: magnavox sweep; 5-RT/33 Spec
Member #: 7190
Registered: 1996-2001
Posted:
483
Name:
Greg Tobin
Name:
Greg Tobin
Company:
Interactive Broadband Technical Services
Occupation:
HFC Engineer/Consultant
Location:
www.interactive-broadband.com
Personal:
Experience:
~45 years
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